FB_BA_HX

This function block is used to calculate the dew point temperature, the specific enthalpy and the absolute humidity. The temperature, the relative humidity and the barometric pressure are required for calculating these parameters.
The enthalpy is a measure for the energy of a thermodynamic system.

VAR_INPUT

rT      : REAL;
rHumRel : REAL;
rAP     : REAL;

rT: Temperature [°C].

rHumRel: Relative humidity [%].

rAP: Hydrostatic air pressure at 1013.25 hPa.

VAR_OUTPUT

lrHumAbs : LREAL;
lrDewPnt : LREAL;
lrE      : LREAL;
lrDHA    : LREAL;
lrSpecV  : LREAL;
lrTWet   : LREAL;

lrHumAbs: Absolute humidity g water per kg dry air [g/Kg].

lrDewPnt: Dew point temperature [°C].

lrE: Enthalpy [kJ/kg].

lrDHA: Density of moist air ρ [kg mixture/m³].

lrSpecV: Specific volume [m³/kg].

lrTWet: Wet bulb temperature [°C].

Requirements